import { pubRequire, changeToForm, getImgUrl } from '@utils/public'
var chrsz = 8
function hex_sha1(s) {
  return binb2hex(core_sha1(str2binb(s), s.length * chrsz))
}
var hexcase = 0
function binb2hex(binarray) {
  let hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef'
  let str = ''
  for (var i = 0; i < binarray.length * 4; i++) {
    str +=
      hex_tab.charAt((binarray[i >> 2] >> ((3 - (i % 4)) * 8 + 4)) & 0xf) +
      hex_tab.charAt((binarray[i >> 2] >> ((3 - (i % 4)) * 8)) & 0xf)
  }
  return str
}
function str2binb(str) {
  var bin = []
  var mask = (1 << chrsz) - 1
  for (var i = 0; i < str.length * chrsz; i += chrsz) {
    bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - (i % 32))
  }
  return bin
}

function core_sha1(x, len) {
  /* append padding */
  x[len >> 5] |= 0x80 << (24 - (len % 32))
  x[(((len + 64) >> 9) << 4) + 15] = len
  var w = Array(80)
  var a = 1732584193
  var b = -271733879
  var c = -1732584194
  var d = 271733878
  var e = -1009589776
  for (var i = 0; i < x.length; i += 16) {
    var olda = a
    var oldb = b
    var oldc = c
    var oldd = d
    var olde = e
    for (var j = 0; j < 80; j++) {
      if (j < 16) {
        w[j] = x[i + j]
      } else {
        w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1)
      }
      var t = safe_add(
        safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
        safe_add(safe_add(e, w[j]), sha1_kt(j))
      )
      e = d
      d = c
      c = rol(b, 30)
      b = a
      a = t
    }
    a = safe_add(a, olda)
    b = safe_add(b, oldb)
    c = safe_add(c, oldc)
    d = safe_add(d, oldd)
    e = safe_add(e, olde)
  }
  return [a, b, c, d, e]
}
function sha1_ft(t, b, c, d) {
  if (t < 20) {
    return (b & c) | (~b & d)
  }
  if (t < 40) {
    return b ^ c ^ d
  }
  if (t < 60) {
    return (b & c) | (b & d) | (c & d)
  }
  return b ^ c ^ d
}
function sha1_kt(t) {
  return t < 20
    ? 1518500249
    : t < 40
    ? 1859775393
    : t < 60
    ? -1894007588
    : -899497514
}
function safe_add(x, y) {
  var lsw = (x & 0xffff) + (y & 0xffff)
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
  return (msw << 16) | (lsw & 0xffff)
}
function rol(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt))
}
/* 获取封面图 */
export function getVideoImg(vid, polyvNumber) {
  if (!polyvNumber.polyvUserId) {
    console.log('没有polyvUserId')
    return
  }
  let userid = polyvNumber.polyvUserId
  let secretkey = polyvNumber.polyvSecretKey
  // 13位的当前时间毫秒级时间戳
  let ptime = new Date().getTime()

  // sign的生成规则(ptime=参数&t=参数&vid=参数secretkey经过SHA-1加密再经过大写化)
  // (注意：参数为空时，则在生成sign的时候不需要添加此字段。例如如果这里没有t，则不需要拼接&t=参数)
  var str = 'ptime=' + ptime + '&t=2' + '&vid=' + vid + secretkey
  var sign = hex_sha1(str).toUpperCase()
  let url = getImgUrl + '/v2/video/' + userid + '/get-image'

  let obj = {
    ptime: ptime,
    t: 2, // 值为1时，表示获取视频首图的缩略图
    vid: vid,
    sign: sign
  }
  let params = changeToForm(obj)
  return new Promise((resolve, reject) => {
    pubRequire(
      'post',
      url,
      params,
      (response) => {
        if (response.code === 200) {
          resolve(response.data)
        } else {
          reject(response)
        }
      },
      (response) => {
        reject(false)
      }
    )
  })
}
